The causes of vomiting in children include acute gastroenteritis, respiratory diseases and intussusception, which are analyzed as follows: 1. Acute gastroenteritis: children’s digestive system is not yet well developed, when germs infection, cold, etc. can cause gastrointestinal dysfunction, abdominal pain, vomiting or diarrhea and other symptoms, the symptoms are serious can lead to dehydration, manifested in small amount of urine, poor mental state. 2. Respiratory diseases: when external germs invade the respiratory tract, resulting in acute tonsillitis, bronchitis, can reflexively cause vomiting, while at this time the children’s gastrointestinal function is weakened, can be accompanied by abdominal discomfort, vomiting and other symptoms. 3. Intussusception: children can have abdominal pain, repeated vomiting, and in severe cases, intestinal necrosis can lead to jam-like blood stools. There may be other reasons for children’s vomiting, it is recommended to go to the hospital in time for relevant examinations to clarify the cause of the disease and actively treat the symptoms.